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Investments - Investments in Variable Interest Entities (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss $ 2,800,000 $ 2,100,000
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]    
Variable Interest Entity [Line Items]    
Investment [1] 4,699,000 3,899,000
Maximum Exposure to Loss [1] $ 5,679,000 $ 4,879,000
[1] The Company has entered into a subordinated loan agreement with Aqua, whereby the Company agreed to lend the principal sum of $980.0 thousand. As of December 31, 2019 and 2018, the Company’s maximum exposure to loss with respect to its unconsolidated VIEs includes the sum of its equity investments in its unconsolidated VIEs and the $980.0 thousand subordinated loan to Aqua.